Too much dancing

[Sibyll]

I want to play chess

Gear checks aren't playing chess, they're the sign in front of a ferris wheel that says "You must be this tall to ride". I don't really see where the strategy is in wait until 50% then nuke it until it's dead. Honestly what you are describing sounds more like a FATE than anything else.

I'm curious but what were those Wizards doing from 100-20% HP? Were they AFK?

Moving around at least requires personal awareness, knowledge of the bosses rotation, and properly timing skills to avoid having to interrupt a channel to avoid AoEs. Standing still and repeating your Max DPS skill rotation is mind numbing.